package com.f.manage.面向对象.superr;

public class Child extends Person{

    public String grade;

    Child(){
//        String age = super.name;
//        String pass = super.pass;
//        super.cal();
//        super.cal("");
//        super.Person();
    }
    public static void main(String[] args){

        Child p = new Child();

        System.out.println(p.name);
        String s = null;
        if( (s!=null) && (s.length()>0) ){

        }
    }

}